Vulcanizing apparatus



(No Modl.) Y

A. D. BARRETT.

VULGANIZING APPARATUS.

Patented Nov. 7, 1893.

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UNITED STATES APATENT OFFICE.

ADDISON RRARRETT, OF NORFOLK, vIReINIA.

VU LCANIZING APPARATUS.

SPECIFICATIONforming part of Letters Patent No. 507,980, dated November *7, 1893. Application filed December 23, 1892. Serial No. 456,196. (No modeld To all' whom it may concern.-

Be it known that I,- ADDIsoN D. BARRETT, a citizen of the United States, residingin the city of Norfolk, in the State of Virginia, have invented certain new and useful Improvements in Vulcanizing Apparatus, of which the following is a specification.

My invention relates to improvements lin dental vulcanizing flasks, and more particularly to clamps for connecting the sections of such asks together; and it has for its general object to provide such a clamp of a peculiar and advantageous construction and one adapted to exert an equable and yielding pressure upon the sections so as to prevent lcracking of the plate and insure the perfect formation of the same.

With the foregoing end in View, the invention will be fully understood from the following description and claims when taken in connection with the annexed drawings, in Which- Figure 1, is a perspective view of a ask embodying my invention, and Fig. 2 is a vertical, diametrical section of the same.

Referring by letter to said drawingsz-Ga indicates the vulcanizing flask, which is designed to receive the plaster mold by which the rubber plate is formed. This flask is preferably of a general circular form and is preferably bulged at its middle in the manner illustrated; and it comprises the lower section f, provided at diametrically opposite points with the seats or sockets g; the upper section f', having the'depending projections or lugs h, adapted to take into the seats or sockets g, and guide the section f', in its downward movement; and the circular cover I-I, which is preferably provided with a depending ange, and with a central opening j; such central opening being adapted to permit the escape of the surplus plaster in order that the teeth may be more securely xed in the plate.

A, indicates the main frame of the clamp which is preferably made of two pieces of metal A', C, as illustrated. The piece or section A', which is preferably formed from steel is bent into a general bail shape as shown, and it has its portion k, which rests beneath the flask, of a greater width than its branches Z, which take up alongside the iiask and are connected to the piece C, in order to form a broad support for the flask.

- B, indicates the screw through the medium of which pressure is exerted upon the sections of the flask so as to move the same together. This screw B,takes through a vertically-disposed, threaded aperture in the section C, of the frame A, and it has its lower portion reduced at m, in order to aord a shoulder n, to bear upon the springs D, which are preferably formed from spring steel and are secured upon the reduced portion m, by a pin p, or in any other approved manner.

As better shown in Fig. 1, the springs D, are of a concavo-convex form and of alength approximating the diameter of the flask; and they are disposed at right angles to each other and engage the cover H, only at point-s adjacent to the edge or periphery thereof,

, whereby it will be seen that when the screw B, is turned downwardly to exert a pressure upon the flask, such pressure by reason of the springs, will be made yielding and will be equally distributed over the surface of the cover H, so that all sides of the section f', and the cover will be simultaneously moved downward when the rubber is caused to run or move by theheat of the vulcanizing oven. Thus the objectionable cracking of the plate, heretofore caused by Iirst screwing down one side of the upper section and then the other, is obviated, and the formation of a perfect plate insured, which is a desideratum.

In order to hold the springs D, in their positions at right angles to each other, I have provided the link or brace E, illustrated in Fig. l. This link or brace is preferably formed from a light piece of metal and it has its ends connected in any preferred manner to the springs D, adjacent to the outer ends of the same, so as to securely hold them apart.

It will be noted from the foregoing description taken in connection with the drawings that all of the parts of my improved device are durable and practical; and it will also be noted that by reason ofthe peculiar construction set forth, a strong though yielding pressure on the iask, is secured, which is desirable in this class of devices.

IOO

Having described my invention, what I claim is- 1. In a vuleanizing apparatus, the combination with a sectional flask; of a clamp frame surrounding the same, a pressure screw bearing in said frame, and two concave-convex springs connectedto the screw and disposed at right angles to each other; the said springs being adapted to engage the `top Vof the flaskat points adjacent to lche edge or periphery thereof, substantially as and for the purpose set forth.

2. In a Vuleanizing apparatus, the combi-` nation with a fiask comprising the lower section f, having the seats or sockets g, the upper section f having the depending projections or lugs h, adapted to engage the seats or sockets of the lower section, and the cover H having the central aperture j; of the clamp frame, a pressure screw bearing in said frame, and two concave-convex springs connected to `thescrew and disposed at right angles to each other; the said springs being adapted to e11- gageithe coverI-I, at points adjacent to the edge thereof, all substantially as and for the purpose set forth.

ADD-ISGN d). BARRETT. Witnesses:

Trios. I-I. BAGWELL, W. H. BURROUGHS. 

